Door opener



FIG. 1 is a perspective view of a door opener showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken line showing of the door opener is for the purpose of illustrating portions of the door opener which form no part of the claimed design. 

CLAIM The ornamental design for a door opener, as shown and described. 